package com.kznnc.data_structure.structure;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @Description
 * @Author houchenkai
 * @Created Date: 2021/7/26 11:25
 * @ClassName
 */
public class MapTest {

    public static void main(String[] args) {
        ConcurrentHashMap<String,String> map = new ConcurrentHashMap<>(3);
        map.put("123","123");

//        HashMap<String,String> map = new HashMap<>(1,0.75f);
//        map.put(null,"123");


    }
}
